Vancouver is 10 hours behind Istanbul

There is no standard 8-to-6 overlap. Someone joins early or late.

A 10-hour difference puts Istanbul and Vancouver out of sync — when one team is mid-morning, the other is fast asleep. Consider rotating the inconvenience: one week Istanbul takes the early call, the next week Vancouver does. Finally, Vancouver observes daylight saving and Istanbul doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.